(modules) don't rescan std and packages modules when using -r

4 files changed, 11 insertions, 7 deletions

diff --git a/xmake/rules/c++/modules/clang/scanner.lua b/xmake/rules/c++/modules/clang/scanner.lua
index b7988806c..96aa6a7e2 100644
--- a/xmake/rules/c++/modules/clang/scanner.lua
+++ b/xmake/rules/c++/modules/clang/scanner.lua
@@ -28,7 +28,7 @@ import("support")
 import(".scanner", {inherit = true})
 
 -- scan module dependencies
-function scan_dependency_for(target, sourcefile, opt)
+function scan_dependency_for(target, sourcefile, rescan, opt)
 
     local compinst = target:compiler("cxx")
     local changed = false
@@ -87,7 +87,7 @@ function scan_dependency_for(target, sourcefile, opt)
 
         local rawdependinfo = io.readfile(jsonfile)
         return {moduleinfo = rawdependinfo}
-    end, {dependfile = dependfile, files = {sourcefile}, changed = target:is_rebuilt(), values = compflags})
+    end, {dependfile = dependfile, files = {sourcefile}, changed = rescan, values = compflags})
     return changed
 end
 
diff --git a/xmake/rules/c++/modules/gcc/scanner.lua b/xmake/rules/c++/modules/gcc/scanner.lua
index 862df3c43..b0cdda7af 100644
--- a/xmake/rules/c++/modules/gcc/scanner.lua
+++ b/xmake/rules/c++/modules/gcc/scanner.lua
@@ -28,7 +28,7 @@ import("builder")
 import(".scanner", {inherit = true})
 
 -- scan module dependencies
-function scan_dependency_for(target, sourcefile, opt)
+function scan_dependency_for(target, sourcefile, rescan, opt)
 
     local compinst = target:compiler("cxx")
     local baselineflags = {"-E", "-x", "c++"}
@@ -77,7 +77,7 @@ function scan_dependency_for(target, sourcefile, opt)
 
         local dependinfo = io.readfile(jsonfile)
         return { moduleinfo = dependinfo }
-    end, {dependfile = dependfile, files = {sourcefile}, changed = target:is_rebuilt(), values = compflags})
+    end, {dependfile = dependfile, files = {sourcefile}, changed = rescan, values = compflags})
     return changed
 end
 
diff --git a/xmake/rules/c++/modules/msvc/scanner.lua b/xmake/rules/c++/modules/msvc/scanner.lua
index 912e643ab..07f7de41e 100644
--- a/xmake/rules/c++/modules/msvc/scanner.lua
+++ b/xmake/rules/c++/modules/msvc/scanner.lua
@@ -29,7 +29,7 @@ import("builder")
 import(".scanner", {inherit = true})
 
 -- scan module dependencies
-function scan_dependency_for(target, sourcefile, opt)
+function scan_dependency_for(target, sourcefile, rescan, opt)
 
     local msvc = target:toolchain("msvc")
     local compinst = target:compiler("cxx")
@@ -68,7 +68,7 @@ function scan_dependency_for(target, sourcefile, opt)
 
         local dependinfo = io.readfile(jsonfile)
         return { moduleinfo = dependinfo }
-    end, {dependfile = dependfile, files = {sourcefile}, changed = target:is_rebuilt(), values = compflags})
+    end, {dependfile = dependfile, files = {sourcefile}, changed = rescan, values = compflags})
     return changed
 end
 
diff --git a/xmake/rules/c++/modules/scanner.lua b/xmake/rules/c++/modules/scanner.lua
index 3c7a04aa4..12c85e73e 100644
--- a/xmake/rules/c++/modules/scanner.lua
+++ b/xmake/rules/c++/modules/scanner.lua
@@ -510,7 +510,11 @@ end
 
 function _do_scan(target, sourcefile, opt)
     profiler.enter(target:fullname(), "c++ modules", "scanner", "scan dependencies for", sourcefile)
-    local changed = _scanner(target).scan_dependency_for(target, sourcefile, opt)
+    local fileconfig = target:fileconfig(sourcefile)
+    local from_package = fileconfig and fileconfig.from_package
+    local is_std = path.basename(sourcefile) == "std" or path.basename(sourcefile) == "std.compat"
+    local rescan = target:is_rebuilt() and not from_package and not is_std
+    local changed = _scanner(target).scan_dependency_for(target, sourcefile, rescan, opt)
     if changed or not support.localcache():get2(target:fullname(), "module_mapper") then
         support.memcache():set2(target:fullname(), "modules.changed", true)
     end